The Goosebumps Box Set #9-12 includes four novels written by R.L. Stine, including The Haunted Mask books 9-12. Published by Scholastic in the 1990s, the trade paperback format books are intended for young adults, ages 9-12, and adults who enjoy horror and general fiction. The vintage box set is not signed or inscribed, and does not include an ex libris. The novels are in English and have a height of 7.9in and a width of 5.5in.